Questions and Answers
What is aquaculture?
The farming of aquatic organisms in inland and coastal areas, involving intervention in the rearing process to enhance production and the ownership of the stock being cultivated.
Which of the following are classifications of aquaculture? (Select all that apply)
The primary productivity in aquaculture refers to ______.
Autotrophs
Secondary productivity refers to heterotrophs such as fish and shrimp.
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What does carrying capacity mean in the context of aquaculture?
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Which of the following are major nutrients required in aquaculture? (Select all that apply)
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Match the following types of lime to their uses in aquaculture:
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What is one common organic fertilizer used in aquaculture?
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To prepare a pond for aquaculture, it should be drained totally and dried for ______ weeks.
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Study Notes
What is Aquaculture?
- Farming of aquatic organisms in inland and coastal areas, requiring human intervention for enhanced production.
- Ownership of cultured stock is usually individual or corporate.
- Classified into various categories based on aquatic environment, species cultured, systems utilized, and intensity levels.
Aquaculture Classifications
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Aquatic Environment:
- Freshwater Aquaculture
- Brackishwater Aquaculture
- Mariculture
- Aquasilviculture
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Species Cultured:
- Finfish, shrimp, seaweed, bivalves
- Monoculture (single species) and polyculture (multiple species)
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Systems/Structures Utilized:
- Ponds, raceways, pens, cages, and tanks
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Level of Intensity:
- Ranges from backyard aquaculture to super-intensive aquaculture
Foundations of Aquaculture
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Productivity:
- Defined as the rate of energy/biomass production per area over a specified time (e.g., kcal/m²/year).
- Primary Productivity: Driven by autotrophs such as plants and algae.
- Secondary Productivity: Driven by heterotrophs like fish and shrimp.
Carrying Capacity
- Refers to the amount of an activity that can sustain the environment's capacity.
- In aquaculture, indicates maximum sustainable fish quantity without harming the ecosystem.
- Can be enhanced through practices like fertilization, supplemental feeding, and water quality maintenance.
Nutrients and Fertilizers
- Essential for increasing carrying capacity and productivity in aquaculture systems.
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Major Nutrients:
- Nitrogen (N): Exists in forms like N2, NH4, NO2, NO3.
- Phosphorus (P): Found as orthophosphate in natural waters.
- Potassium (K): Key for osmoregulation in plants.
Types of Fertilizers
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Organic Fertilizers:
- Include manure and composts; enhance soil quality and promote zooplankton growth.
- Chicken manure is common, applied at 500-1000 kg/ha.
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Inorganic Fertilizers:
- Provide precise macro-nutrient concentrations.
- Classified by N, P, K percentages or as single, incomplete, or complete fertilizers (e.g., Urea, Superphosphate, Triple 14).
Liming
- Used to neutralize acidic soils and increase alkalinity.
- Common types include:
- Agricultural Lime (CaCO3)
- Hydrated Lime (Ca(OH)2)
- Quick Lime (CaO)
Pond Preparation
- Steps for effective pond preparation involve:
- Total drainage and drying of ponds for 1-3 weeks.
- Repairing gates and dikes, leveling the pond bottom, and eliminating pests and weeds.
Additional Fertilizing Agents
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Teaseed (Camellia dripisera):
- Contains 10-15% saponin; applied at 200 kg/ha for soil and productivity enhancement.
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Tobacco Dust:
- Used as an organic fertilizer with pest control properties.
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Description
Explore the fundamentals of aquaculture, the farming of aquatic organisms in various environments. This quiz delves into the processes, interventions, and ownership involved in enhancing production in aquaculture. Perfect for students and enthusiasts of fisheries and ocean sciences.
